Oh, one last thing to check with you - when you began medicating, did you remove the carbon sponge from your filter?
Regards - Athena
Thanks for your reply, Athena! I'd never know that what the filter manual says was actually bad advice! It's my first fish, I'm a total newbie, but I'm trying my best to take good care of him. And since I don't have any experience at all, I am instinctively prone to trust in manuals... my LFS sellers, them I don't trust so much anymore.
And by carbon sponge, do you mean that carbon cushion? Anyway, no, I didn't. Should I have removed it?? Will do it right now before medicating him again ;-)
Today he's swimming a bit rapidly and in a kind of funny, shaky way, as if he was restless. Maybe he's getting annoyed of being sick... I don't know. He swims, swims, swims... and stops near the surface, either hiding behind his plant or just anywhere =/
Even though he ate the tinsy bits of peas I fed him with (which is a quite messy thing to do - I'll have to siphon the gravel later because of that!), I'm worried... I've never seen him swimming like this before. His eye is just as big and the scales on the right side of his face can be seen from above, as if they were pineconing... but not more than before today, though.
Again, thanks VERY MUCH for all your help and attention!